An alternative phrase to "air jerk", meaning the same thing, but able to be said in mixed company or situations in which air jerk would seem crass. The definition is taken from using a shake weight that you shake up and down, similar to the air jerk motion.
Dave to the plumber: "Why didn't you show up yesterday?"
Plumber: "I had upgrade my cell phone, my contract was up."
Dave: "Shake Weight!"